In Oracle 11gR2, if editioning was enabled for a user and you created a new object that was an editionable object in that user's schema, the object you created was automatically editionable. It was not possible to create non-editionable objects of one of these types in an edition enabled schema.

Oracle 12c allows you to create non-editionable objects of these editionable types in an edition enabled schema.

ALTER object

The ALTER statement for editionable object types have be amended to allow their editionable status to be changed. This is only possible prior to editioning being enabled on the user. Once editioning has been enabled, the editionable status of the object is fixed.